MATLAB Answers


Interpolating latitudes and longitudes

Asked by emhol241
on 28 Oct 2018
Latest activity Edited by jonas
on 28 Oct 2018
I have a set of latitudes and longitudes (both 506 x 270) sampled at 5km resolution and need it in 1km resolution (size 2030 x 1354). How do I interpolate between points to do this?


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1 Answer

Answer by jonas
on 28 Oct 2018
Edited by jonas
on 28 Oct 2018

lat and lon are your 5-km-resolution arrays and v (506x270) is the variable you want to interpolate.
% create finer grid
[latq lonq] = meshgrid(min(lat(:)):1:max(lat(:)),min(lon(:)):1:max(lon(:)))
% interpolate
vq = griddata(lat,lon,v,latq,lonq)


I am confused as to what I use as v... I need to interpolate lat and long themselves?
I have a variable which is already 2030x1354 (i.e. 5 times the size of lat and long) and cannot do the data analysis I want until I have the coordinates in the same size as the variable
on 28 Oct 2018
Oh.. then just use meshgrid to build your grid without interpolating. Just skip the second part. I just assumed that your 5 km grid resolution had some meaning because you mentioned it, as well as interpolation, in the question... Creating a grid has nothing to do with either.

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